Stadium: Court 4 Round: 62 Ground: Hardcourt outdoor
| ITF M15 Ramat Hasharon | 2021/05/04 07:00 | Karlo Cubelic v Bradley Paliska | 4-6,4-6 |
| ITF M15 Ramat Hasharon | 2021/05/03 07:00 | Karlo Cubelic v Ofek Amoyal | 6-3,6-3 |
| ITF M25 Meerbusch | 2021/04/11 13:00 | Tomas Papik v Karlo Cubelic | 3-6,2-6 |
| ITF M15 Sharm El Sheikh | 2021/04/06 07:30 | Karlo Cubelic v Lukas Pokorny | 6-7,1-6 |
| ITF M15 Sharm El Sheikh | 2021/04/05 10:00 | Karlo Cubelic v Inaki Cabrera Bello | 4-6,7-5,10-8 |
| ITF M15 Sharm El Sheikh | 2021/03/30 08:40 | Mattia Bellucci v Karlo Cubelic | 6-2,6-2 |
| ITF M15 Sharm El Sheikh | 2021/03/29 13:00 | Jack Gibbens v Karlo Cubelic | 3-6,4-6 |
| ITF M15 Sharm El Sheikh | 2021/03/28 16:00 | Inaki Cabrera Bello v Karlo Cubelic | 1-6,5-7 |
| ITF M15 Ramat Hasharon | 2021/05/02 07:00 | Stefan Simeunovic v Roee Benya | 3-6,4-6 |